Tuesday we talked about ratios. A ratio is a pair of positive numbers that is used to compare two sets, it can be written --a to b as a fraction a/b.Some may like to write it as a:b.Here is an example of a problem we did in class: What is the ratio of male to female members of the class, we can say 6 males and 14 females or we can write it 6:14. that would be your ratio. The presentations were very good, it is hard to believe this class is over after thursday but i guess all good things come to a end.
http://www.purplemath.com/modules/ratio.htm
Wednesday, March 9, 2011
Friday, March 4, 2011
Operations with Decimals
Today we talked about repeated addition with whole numbers and multiplication. An example of this would be --- 4 x 0.3 you would have to take 0.3 and add it four times, like so ---- 0.3 + 0.3 + 0.3 + 0.3 = 1.2.
We all so learned how to multiply decimals together and to move the decimal by how many places are behind thedecimal. This picture below shows the way to do it.
picture by coolmath.com
We talked about division with decimals with the Powers of Tens. An example of this would be----the number---2.3798662 / 1000 the question is which way would you move the decimal? the answer is to the left because we are dividing into 1000 pieces. I really like the refresher on decimals i had forgotten alot of it.
I just want to say i enjoyed the cookie very much.
Tuesday, March 1, 2011
Decimals
Today we learned about decimals which is defined as : any number written in base-ten positional numeration.
A decimal can be written as 25.2 that means to the left of the decimal we look at place value, and to the right of the decimal we are looking at number of decimal places. The number 25.2 can be expressed as twenty five and two tenths, because the left of the decimal you count ones,tens,hundreds,thousands.The right of the decimal you count tenths,hundreds,thousandths.The teacher showed us how to used shaded decimals squares to let us see how it looks with a flat of 100. An example of this would be if you have 100 blocks and one block was shaded in it would represent 0.01 because, since the flat we are using is 100 the numbers to the right of the decimal would be the tenths place and the hundredths place. I enjoyed learnig about decimals again to refresh my skills. The presentations were very good .Here is a good video on decimals.
A decimal can be written as 25.2 that means to the left of the decimal we look at place value, and to the right of the decimal we are looking at number of decimal places. The number 25.2 can be expressed as twenty five and two tenths, because the left of the decimal you count ones,tens,hundreds,thousands.The right of the decimal you count tenths,hundreds,thousandths.The teacher showed us how to used shaded decimals squares to let us see how it looks with a flat of 100. An example of this would be if you have 100 blocks and one block was shaded in it would represent 0.01 because, since the flat we are using is 100 the numbers to the right of the decimal would be the tenths place and the hundredths place. I enjoyed learnig about decimals again to refresh my skills. The presentations were very good .Here is a good video on decimals.
Friday, February 25, 2011
Fractions
Thursday in class we learned about fractions. A fraction is a order pair of integers that look like this ( 1/2), sometimes the numbers are writen one number above another. The top number represents the numerator and the secound number represents the denominator.The most common use of fractions involve (The part to whole concept). For example:
Image taken from:room4slearning blog.blogspot.com
All the circles are a whole but when you color half of the circle, you now get 2 halfs of the 1 whole circle which is written 1/2 as pictured above. The same operation would be done for the 1/3 circle an the 3/6 circle. Some teachers use fraction strips that represent the same concept as the circles.We learned that when adding fractions you have to find the same denominator, so you would look for the LCM of the two numbers.Than you would multiply the two fractions numerator and the denominator by the factors that make the LCM.Than you would add the two numerators and the two denominator together for your answer.
Image taken from:room4slearning blog.blogspot.com
All the circles are a whole but when you color half of the circle, you now get 2 halfs of the 1 whole circle which is written 1/2 as pictured above. The same operation would be done for the 1/3 circle an the 3/6 circle. Some teachers use fraction strips that represent the same concept as the circles.We learned that when adding fractions you have to find the same denominator, so you would look for the LCM of the two numbers.Than you would multiply the two fractions numerator and the denominator by the factors that make the LCM.Than you would add the two numerators and the two denominator together for your answer.
Tuesday, February 22, 2011
MULTIPLYING,DIVIDING,ADDING, AND SUBTRACTION OF INTEGERS
The lesson today was about integers and Time and Temp, Debits and credits , i was confused on how she showed us on how to do the problems.The man walking forward and backward, i did not get it. Today we had two presentations on fractions they both were good, since i have not done a fraction for a while. This web site help me understand what she was talking about in class .
http://www.mathleague.com/help/integers/integers.htm#addingintegers
http://www.mathleague.com/help/integers/integers.htm#addingintegers
Thursday, February 17, 2011
INTEGERS RAP
This is a video about integers which we learned about today in class. We learned about negative and positive intergers that can be confusing. Both of the presentations were done very well.
http://www.youtube.com/watch?v=yteDWPyeNYI&feature=player_detailpage
http://www.youtube.com/watch?v=yteDWPyeNYI&feature=player_detailpage
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